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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d38c8e5325387f63605b3511de5bd912f90b8f70c291e1c897d8194c76ae9d6' 
  AND token = 'JpyITjsumgK4zkyy/sxPOE1I2ZuHlcfoUc50atf/Lp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}